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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you
 * may not use this file except in compliance with the License. You
 * may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License. See accompanying
 * LICENSE file.
 */
package com.gemstone.gemfire.internal;

import com.gemstone.gemfire.StatisticDescriptor;
import com.gemstone.gemfire.Statistics;
import com.gemstone.gemfire.StatisticsFactory;
import com.gemstone.gemfire.StatisticsType;



public class HistogramStats {
  /** stat type description */
  private final static String hist_typeDesc = "A bucketed histogram of values with unit ";
  
  private final int statCounterIndex[];

  private final long bp[];
  
  private final Statistics stats;  
  
  /**
   * Create a set of statistics to capture a histogram of values with the given break points.
   * @param name a unique name for the histogram type
   * @param unit the unit of data collected
   * @param factory
   * @param breakPoints the breakpoints for each bucket
   * @param largerIsBetter
   */
  public HistogramStats(String name, String unit, StatisticsFactory factory, long[] breakPoints, boolean largerIsBetter) {
    this.bp = breakPoints;
    StatisticDescriptor[] fieldDescriptors = new StatisticDescriptor[this.bp.length*2];
    int k = 0;
    for (int bucketNumber = 0; bucketNumber < this.bp.length; bucketNumber++) {
      String desc = (bucketNumber < this.bp.length-1 ? "ForLTE" : "ForGT") + this.bp[bucketNumber]; 
      fieldDescriptors[k] = factory.createIntCounter("BucketCount" + desc,  
          "Number of data points in Bucket " + bucketNumber, "count", !largerIsBetter);
      k++;
      fieldDescriptors[k] = factory.createLongCounter("BucketTotal" + desc,
          "Sum of Bucket " + bucketNumber, unit, !largerIsBetter);
      k++;
    }
    StatisticsType hist_type = factory.createType("HistogramWith" + breakPoints.length + "Buckets",
        hist_typeDesc + unit + " for " + breakPoints.length + " breakpoints", fieldDescriptors);
    this.statCounterIndex = new int[this.bp.length*2];
    k=0;
    for (int bucketNumber = 0; bucketNumber < this.bp.length; bucketNumber++) {
      String desc = (bucketNumber < this.bp.length-1 ? "ForLTE" : "ForGT") + this.bp[bucketNumber]; 
      this.statCounterIndex[k] = hist_type.nameToId("BucketCount" + desc);
      k++;
      this.statCounterIndex[k] = hist_type.nameToId("BucketTotal" + desc);
      k++;
    }
    this.stats = factory.createAtomicStatistics(hist_type, name, 0L, 0);
  }

  public void endOp(long delta) {
    int index = this.statCounterIndex.length - 2;
    for (int i=0; i